Good thing about early GM cars... is that they can be converted to Pontiacs, Buicks, Chevy's, Oldsmobile's and Caddy's with out a whole lot of work....
...was used by an assortment of service companies before, through and after the 50's.
We still had one assigned to our Air Force Weapons Section as a crew vehicle in the late 60's.
State of the art bomb technology... not so much with transportation.